There are three products currently displayed on this page. All products are experimental.
First is an experimental tracker and Tropical Cyclogenesis product. Tracks are generated from the GEFS 21 member model grids. Cones show likely track and storm probability for 48/120 hour forecast. These are in no way based on official systems (labels are only for reference these are not official forecasts), though hopefully when an official system exists the tracker will also identify it. This product has mouse over ability with extra system based products.
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Detailed readme about methodology and graphics here
Second, 150 km density probability tracks based on center generated tracks, using adecks from the respective centers. ECMWF tracks anything while GEFS only tracks official systems. These tracks have not been tuned for "genesis" so ECMWF shows storms all over the show a lot of the time.
Third, track density plots based on center generated official tracks for storms identified by NHC.